The Physiological Burden of Prolonged PPE Use on Healthcare Workers during Long Shifts
CDC acknowledges significant harms of N95s due to CO2 buildup.
To avoid these, CDC recommends not wearing N95 for more than 1 hour.
In other words, all-day use advocated by Covidians causes harm, without demonstrated benefit.
The Physiological Burden of Prolonged PPE Use on Healthcare Workers during Long Shifts
https://blogs.cdc.gov/niosh-science-blog/2020/06/10/ppe-burden/